BY J. C. ANCEAUX Since the appearance of Brugmann's famous article on the relation ships of the Indo-European languages in 1884, the subject of sub grouping of languages as a methodological problem has been raised only occasionally. To this apparent lack of interest in a major point in comparative linguistics several causes can be assigned. One of them is that a consensus has been reached about the main outlines of the family-tree for the language-family which has received more attention than any other: the Indo-European. Another explanation is that for most of the branches of this family...